﻿PTERASPIDJS. 175 



Scaphaspis obovata, A. von Alth, Abhandl. k. k. geol. Reichs- 

 anst. vol. vii. no. 1 (1874), p. 51, pi. iii. fig. 1. — Upper 

 Silurian ; Dobrowlany, Galicia. 



Scaphaspis radiata, A. von Alth, ibid. p. 50, pi. ii. fig. 6. — Upper 



Silurian : Zaleszczyki, Galicia. 



Fragments of Pteraspidian shields, not sufficiently complete for 

 precise generic determination, are met with in the Lower Devonian 

 of Cornwall, and were originally described as fossil sponges by M'Coy, 

 under the name of Steganodiciyum cornubicum 1 . Their fish-like 

 character was first noted by C. W. Peach 2 , who collected many 

 specimens ; they were subsequently assigned to Pteraspis by J. W. 

 Salter 3 , and finally named Scaphaspis cornuoic.us byE. Ii. Lankester 

 and H. Woodward 4 , and J. E. Lee. Numerous fragments from 

 Polperro are preserved in the Lee Collection, and the following is a 

 larger specimen : — 



38570 (Invertebrate Register). Small slab with portions of a shield 

 showing the external striated surface and the middle can- 

 cellated layer ; Fowey. Purchased, 1858. 



According to F. Schmidt (Verhandl. russ.-kais. mineral. Ges. [2] 

 vol. viii. 1873, p. 136, pi. v. figs. 9, 10), the so-called Palceoteuthis 

 marginalis, E. von Eichwald (Analect. Zool. u. Palaeont. Russlands, 

 1871, p. 5, pi. i. fig. 12), from the Petchora, is a doubtful Pteras- 

 pidian ; and to the same family may probably be referred the genus 

 and species, Tolypelepis undtdatus, C. H. Pander (Foss. Fische Silur. 

 Syst. 1856, p. 61, pi. vi. fig. 24), founded upon a fragment of dermal 

 plate from the Upper Silurian of Ohhesaar, Isle of Oesel. 



Fragments of dermal plates, perhaps referable to Pteraspidians, 

 and consisting of numerous, irregular, closely arranged, narrow 

 shining scales, are met with in the Lower Old Red Sandstone of Here- 

 fordshire, and named Kallostrakon podura, E. R. Lankester, Fishes 

 Old Red Sandst. pt. i. (Pal. Soc. 1870), p. 61, pi. xiii. figs. 20, 21, 

 pi. xiv. fig. 6. [Oxford Museum.] The following are specimens of 

 this character : — 



45980. Several fragments, varying in coarseness : Lower Old Red 

 Sandstone, Bush Pitch, Ledbury. Lightbody Bequest. 



1 F. M'Coy, Ann. Mag. Nat. Hist. [2] vol. viii. (1851), p. 481, and Brit. 

 Palreoz. Foss. (1851), pi. ii. a. figs. 1-3. 



2 C. W. Peach, Rep. Brit. Assoc. 1843 (1844), Trans. Sect. p. 56. 



3 J. W. Salter, in Wyatt-Edgell, Geol. Mag. vol. v. (1868), p. 247. 



4 E. R. Lankester and H. Woodward, Geol. Mag. vol. v. (1868), p. 248 ; J. 

 E. Lee, ibid. [2] vol. ix. (1882), p. 105. pi. iii. figs. 2, 3, 



